Electrochemical machining device, electrochemical machining method, and aircraft engine

Abstract

The application discloses an electrolytic machining device, an electrolytic machining method and an aero-engine, and is applied to auxiliary electrolytic machining of a machine case on an electrolytic machining equipment. The electrolytic machining device comprises a positioning plate, a fixing piece, a sealing assembly, a machining cavity provided on one side of the sealing assembly and communicated to a sealing cavity, and a cathode. The sealing cavity is used for accommodating a machine tool rotating shaft, the positioning plate and the machine case. The cathode is provided with a sealing structure used for cooperating with the sealing assembly when a preset machining gap is left between the cathode and the machine case after the cathode is moved to a preset machining position. The sealing assembly is further provided with a liquid outlet structure used for leading electrolyte in the machining gap out. An isolation piece is used for being covered on a large end of the machine case and being sealingly connected with an inner wall of the large end of the sealing cavity. The electrolyte flow field in the closed structure has high controllability and high stability. The electrolyte uniformly flows through the machining gap and ensures that the electrolyte is full in the machining gap, so that the lack of electrolyte is avoided, and the machining precision is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of electrochemical machining, and in particular, to an electrochemical machining apparatus, an electrochemical machining method, and an aero-engine. Background Technology

[0002] Aero-engine casings are mostly thin-walled structures made of high-temperature alloy materials, with numerous bosses on their surfaces. Traditional milling and turning methods result in severe tool wear, high costs, low efficiency, and are prone to deformation during machining, making them difficult to control and challenging to process. Electrolytic machining, based on the principle of electrochemical anodic dissolution, generates no machining stress, produces no tool wear, and offers high machining efficiency, making it an ideal machining method for removing material from the casing surface.

[0003] Currently, the commonly used electrolytic machining process for removing material from the casing surface involves the casing rotating continuously while the cathode remains stationary. Under electrochemical action, the casing surface material is continuously dissolved. However, this method currently employs tooling fixtures that utilize open flow fields. (Reference) Figure 1 In this open-flow-field tooling fixture, the electrolyte flows into the machining gap between the casing and the cathode through an internal channel of the cathode, and then flows out in a divergent manner, directly into the recovery pipe of the machine tool's machining cavity. This open-flow-field tooling fixture has a simple structure and is easy to operate. However, the flow field parameters such as flow velocity and pressure are very unevenly distributed in the machining gap, with significant differences in different places. The electrolyte flow direction is uncontrollable, and electrolyte shortage is very likely to occur. It has poor stability, uneven conductivity distribution, resulting in different machining speeds in different places, poor machining accuracy, uneven wall thickness, and obvious flow marks on the casing surface. In addition, the electrolyte diffuses in all directions, and the inner wall of the machine tool's machining cavity is often eroded by the electrolyte, especially when using NaCl electrolyte, which causes great corrosion to the inner wall of the machine tool. Summary of the Invention

[0004] This invention provides an electrolytic machining apparatus, an electrolytic machining method, and an aero-engine to solve the technical problem of poor electrolytic machining effect of the casing due to uncontrollable electrolyte flow direction under open flow field.

[0005] The technical solution adopted in this invention is as follows:

[0006] An electrolytic machining apparatus is used to assist in electrolytic machining of a machine casing on an electrolytic machining equipment. The electrolytic machining equipment includes a spindle joint, a cathode, and a machine tool spindle. The spindle joint has a first internal channel through which electrolyte passes, and the cathode has a second internal channel through which electrolyte passes. The electrolytic machining apparatus includes:

[0007] A positioning plate is used to be installed on the machine tool spindle as a positioning reference and mounting base;

[0008] A fastener is used to press and fix the small end of the housing onto the positioning plate so that the housing is axially and radially positioned on the machine tool spindle.

[0009] A sealing assembly is used for installation on an electrolytic machining equipment. The sealing assembly has a sealing cavity for accommodating the machine tool spindle, the positioning plate, and the housing. The sealing cavity is spaced apart from the machine tool spindle, the positioning plate, and the housing. One side of the sealing assembly has a machining cavity that communicates with the sealing cavity for the cathode to pass through. The cathode is provided with a sealing structure for sealing with the sealing assembly when the cathode moves to a preset machining position and leaves a preset machining gap with the housing. The sealing assembly also has a liquid outlet structure for leading out the electrolyte from the machining gap.

[0010] An isolation element is used to cover the large end of the casing and to seal the inner wall of the large end of the sealed cavity.

[0011] As a further improvement to the above technical solution, the positioning plate has a stepped structure for engaging with the small end face of the casing. The stepped structure is annular, and the annular surface of the stepped structure matches the inner annular surface of the small end of the casing to radially position the casing.

[0012] As a further improvement to the above technical solution, the liquid outlet structure includes a main liquid outlet that is axially opened at one end of the sealing assembly near the large end of the casing and communicates with the processing cavity.

[0013] As a further improvement to the above technical solution, the isolation component is provided with an auxiliary liquid outlet to draw out the electrolyte from the inner wall of the casing.

[0014] As a further improvement to the above technical solution, the sealing structure includes a sealing protrusion formed at a predetermined position on the side wall of the cathode, and a first sealing ring is embedded on the side of the sealing assembly facing the machine tool spindle, so that when the machine tool spindle feeds and the cathode extends into the machining cavity to a predetermined depth, the first sealing ring abuts against the end face of the sealing protrusion.

[0015] As a further improvement to the above technical solution, a second sealing ring is embedded in the inner wall of one end of the sealing assembly near the large end of the casing, which cooperates with the outer wall of the isolation member to seal; or, a second sealing ring is embedded in the outer wall of the isolation member, which cooperates with the inner wall of one end of the sealing assembly near the large end of the casing to seal.

[0016] As a further improvement to the above technical solution, the liquid outlet structure is provided with back pressure.

[0017] As a further improvement to the above technical solution, the sealing assembly includes a connecting sleeve that is fixedly connected to the electrolytic machining equipment and sleeved outside the machine tool spindle, and a sealing cover connected to the connecting sleeve. The height of the connecting sleeve is less than the height of the machine tool spindle.

[0018] According to another aspect of the present invention, an electrochemical machining method is also provided, which utilizes any of the electrochemical machining apparatuses described above, the machining method comprising:

[0019] S1. The connecting sleeve is fitted onto the machine tool shaft and fixedly connected to the electrolytic machining equipment;

[0020] S2. The positioning plate is connected to the machine tool spindle and aligned to ensure that the positioning plate is concentric with the machine tool spindle;

[0021] S3. The enclosure is connected to the connecting sleeve. The casing is placed into the sealed cavity from the large end of the enclosure and positioned on the positioning piece. The fixing piece is fixedly connected to the positioning piece to fix the casing axially.

[0022] S4. A second sealing ring is provided between the isolation component and the inner wall of the large end of the enclosure, and a first sealing ring is embedded on the enclosure.

[0023] S5. The two ends of the spindle connector are respectively connected to the machine tool spindle and the cathode;

[0024] S6. The inlet of the spindle connector is connected to the inlet pipe, and the outlet structure of the sealed cover is connected to the outlet pipe;

[0025] S7. The machine tool spindle feed causes the cathode to extend into the machining cavity until the sealing structure presses against the first sealing ring;

[0026] S8. Introduce electrolyte, which enters the processing gap sequentially through the inlet, the first internal channel, and the second internal channel, and flows out through the outlet structure; turn on the processing power supply, set the processing parameters, and perform electrolytic processing.

[0027] According to another aspect of the present invention, an aircraft engine is also provided, including a casing, wherein the above-described electrolytic machining method is applied.

[0028] According to another aspect of the present invention, an aero-engine is also provided, including a casing, wherein the electrolytic machining method described above is applied.

[0029] This invention has the following advantages: By setting a positioning plate on the machine tool spindle for positioning and mounting, the positioning plate is concentric with the machine housing. The sealing assembly is installed on the electrolytic machining equipment so that the machine tool spindle passes through its sealing cavity. The small end of the machine housing is placed in the sealing cavity and positioned on the positioning plate, concentric with the positioning plate and thus concentric with the machine tool spindle. The small end of the machine housing is pressed by a fixing member to fix the machine housing. An isolation member is placed on the large end of the machine housing and sealed to the inner wall of the large end of the sealing cavity. At this time, there are gaps between the sealing cavity and the machine tool spindle, the positioning plate, and the machine housing. When the machine tool spindle drives the machine housing to rotate, the sealing assembly is fixed and does not interfere with the rotating parts. When machining begins, the machine tool spindle feeds, causing the cathode to extend into the machining cavity. When it moves to the preset position, the sealing structure cooperates with the machine housing to seal, and the cathode... A machining gap is formed between the spindle and the casing. Electrolyte is introduced and the power is turned on to start electrolytic machining. The electrolyte flows through the first internal channel of the spindle to the second internal channel of the cathode, flows through the machining edge of the cathode to the machining gap, and is led out by the liquid outlet structure. In the flow field of this closed structure, the electrolyte flow field is highly controllable and stable. The electrolyte flows evenly in the machining gap, ensuring that the electrolyte in the machining gap is full and avoiding liquid shortage, thus greatly improving machining accuracy. The electrolyte flow direction in the machining gap is fixed, flowing in from the same inlet and flowing out uniformly from the liquid outlet structure. The flow field parameters are more uniformly distributed, and the conductivity difference is small, which greatly improves machining accuracy, improves wall thickness uniformity, eliminates surface flow marks, and avoids the problem of uncontrollable flow direction. At the same time, this device can prevent electrolyte splashing, reduce corrosion of the machine tool inner wall, and improve equipment life.

[0030] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a schematic diagram of the electrolyte flow field in existing electrolytic machining methods;

[0033] Figure 2 This is a cross-sectional view of the electrolytic processing apparatus according to a preferred embodiment of the present invention;

[0034] Figure 3 yes Figure 2 A magnified view of part A;

[0035] Figure 4 This is a schematic diagram of the electrolyte flow field according to a preferred embodiment of the present invention;

[0036] Figure 5This is a schematic diagram of the casing;

[0037] 1. Spindle connector 2. Cathode 3. Enclosed cover 4. Main outlet 5. Isolator 6. Fastening screw 7. Casing 8. Auxiliary outlet 9. Second sealing ring 10. Fixing component 11. Positioning plate 12. Connecting sleeve 13. First sealing ring 14. Second internal channel 15. First internal channel 16. Inlet 17. Machining blade 18. Machining gap. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] Reference Figures 2 to 5 A preferred embodiment of the present invention provides an electrolytic machining apparatus for use in auxiliary casing 7 of an electrolytic machining equipment. The electrolytic machining equipment includes a spindle connector 1, a cathode 2, and a machine tool spindle. The spindle connector is provided with a first internal channel 15 for electrolyte to pass through, and the cathode 2 is provided with a second internal channel 14 for electrolyte to pass through. The electrolytic machining apparatus includes:

[0040] Positioning plate 11 is used to be installed on the machine tool spindle as a positioning reference and mounting base;

[0041] The fastener 10 is used to press and fix the small end of the housing 7 onto the positioning plate 11 so that the housing 7 is axially and radially positioned on the machine tool spindle;

[0042] A sealing assembly is used for installation on an electrolytic machining equipment. The sealing assembly has a sealing cavity for accommodating the machine tool spindle, the positioning plate 11, and the housing 7. The sealing cavity is spaced apart from the machine tool spindle, the positioning plate 11, and the housing 7. A machining cavity for the cathode 2 to pass through is opened on one side of the sealing assembly and communicates with the sealing cavity. The cathode 2 is provided with a sealing structure for sealing with the sealing assembly when the cathode 2 moves to a preset machining position and leaves a preset machining gap 18 between itself and the housing 7. The sealing assembly is also provided with a liquid outlet structure for leading out the electrolyte from the machining gap 18.

[0043] The isolation element 5 is used to cover the large end of the casing 7 and to seal the inner wall of the large end of the sealing cavity.

[0044] The working principle of this electrolytic machining device is as follows: A positioning plate 11 is installed on the machine tool spindle as a positioning reference and mounting base. The positioning plate 11 is concentric with the machine housing 7. A sealing assembly is installed on the electrolytic machining equipment so that the machine tool spindle passes through its sealing cavity. The small end of the machine housing 7 is placed in the sealing cavity and positioned on the positioning plate 11, concentric with the positioning plate 11 and thus concentric with the machine tool spindle. The small end of the machine housing 7 is pressed by the fixing member 10 to fix the machine housing 7. The isolation member 5 is covered on the large end of the machine housing 7 and sealed to the inner wall of the large end of the sealing cavity to seal the sealing cavity. At this time, there are gaps between the sealing cavity and the machine tool spindle, the positioning plate 11, and the machine housing 7. When the machine tool spindle drives the machine housing 7 to rotate, the sealing assembly is fixed and does not interfere with the rotating parts. When machining begins, the machine tool spindle feeds and the cathode 2 extends into the machining cavity. When it moves to the preset position, the sealing structure and the machine housing 7 are connected. The housing 7 is sealed, and a machining gap 18 is formed between the cathode 2 and the housing 7. Electrolyte is introduced and the power is turned on to start electrolytic machining. The electrolyte flows through the first internal channel 15 of the spindle to the second internal channel 14 of the cathode 2, flows from the machining edge 17 of the cathode 2 to the machining gap 18, and is led out by the liquid outlet structure. The flow field of the electrolyte in this closed structure has strong controllability and high stability. The electrolyte flows evenly in the machining gap 18, ensuring that the electrolyte in the machining gap 18 is full and avoiding the phenomenon of insufficient liquid, which greatly improves the machining accuracy. The electrolyte in the machining gap 18 has a fixed flow direction, flowing in from the same inlet and flowing out uniformly from the liquid outlet structure. The flow field parameters are more uniformly distributed, and the conductivity difference is small, which greatly improves the machining accuracy, improves the uniformity of wall thickness, and eliminates the phenomenon of surface flow lines. At the same time, this device can prevent electrolyte splashing, reduce the corrosion of the machine tool inner wall, and improve the service life of the equipment.

[0045] In this embodiment, the sealing assembly includes a connecting sleeve 12 that is fitted outside the machine tool spindle and fixedly connected to the electrolytic machining equipment, and a sealing cover 3 connected to the connecting sleeve 12. The height of the connecting sleeve 12 is less than the height of the machine tool spindle, that is, the connecting sleeve 12 is fitted outside the machine tool spindle and fixedly connected to the machine tool, serving as the mounting base for the sealing cover 3. The sealing cover 3 is installed after the positioning component is installed on the machine tool spindle and aligned, thus avoiding interference.

[0046] In this embodiment, the positioning plate 11 has a stepped structure for engaging with the small end face of the casing 7. The stepped structure is annular, and the annular surface of the stepped structure matches the inner annular surface of the small end of the casing 7 to radially position the casing 7. At the same time, the small end of the casing 7 abuts against the end face of the stepped structure to achieve axial positioning. The small end of the casing 7 is pressed against the stepped structure by the fastener 10 connected to the positioning plate 11 to achieve axial fixation.

[0047] Furthermore, the height of the stepped structure is greater than or equal to the thickness of the small end of the casing 7. The fixing member 10 and the positioning plate 11 are connected by screws. The end of the fixing member 10 protrudes to form an annular protrusion for pressing against the inner end face of the small end of the casing 7, so that there is a gap between the fixing member 10 and the positioning member and the annular protrusion can press against the small end of the casing 7 to fix the casing 7.

[0048] In some embodiments, the height of the step structure may be slightly less than the thickness of the small end face of the casing 7, the fastener 10 may be in the shape of a circular plate, and the outer diameter of the fastener 10 may be greater than the diameter of the inner ring surface of the small end of the casing 7 and less than the diameter of the inner wall of the casing 7; the fastener 10 may be pressed against the inner end face of the small end of the casing 7 and connected to the fastener 10.

[0049] In this embodiment, the liquid outlet structure includes a main liquid outlet 4 that is axially opened at one end of the sealing assembly near the large end of the casing and communicates with the processing cavity, so as to guide the electrolyte to flow in a fixed direction in the processing gap 18.

[0050] During the processing, some electrolyte may flow into the cavity of the housing 7 from the gap between the isolator 5 and the housing 7. If the amount of electrolyte is too large, it will cause corrosion and rust on the inner wall of the housing 7. In this embodiment, an auxiliary outlet 8 is provided on the isolator 5 to draw out the electrolyte on the inner wall of the housing 7 and prevent the inner wall of the housing 7 from rusting.

[0051] In this embodiment, the sealing structure includes a sealing protrusion formed at a predetermined position on the side wall of the cathode 2. A first sealing ring 13 is embedded on the side of the sealing assembly facing the machine tool spindle. When the machine tool spindle feeds and the cathode 2 extends into the machining cavity to a predetermined depth, the first sealing ring 13 abuts against the end face of the sealing protrusion. Based on this sealing and mating structure, when the spindle feeds to the predetermined position where the cathode 2 extends into the machining cavity and there is a machining gap 18 between it and the housing 7, the two are sealed to prevent the electrolyte from passing through and thus cooperate with the sealing cavity to close the flow field.

[0052] In this embodiment, a second sealing ring 9 is embedded in the inner wall of the end of the sealing assembly near the large end of the casing, which cooperates with the outer wall of the isolation member 5 to seal. Alternatively, a second sealing ring 9 is embedded in the outer wall of the isolation member 5, which cooperates with the inner wall of the end of the sealing assembly near the large end of the casing to seal. In this embodiment, the isolation member 5 is covered on the large end of the casing 7 and connected to the fixing member 10. Therefore, it rotates with the casing 7 during the processing, and a sealing ring model that is suitable for the processing environment should be selected.

[0053] In some embodiments, the isolation member 5 may include a cover plate for covering the large end of the housing 7 and a sealing cover for sealing the large end of the sealing assembly. The second sealing ring 9 is disposed on the outer ring of the sealing cover, that is, the cover plate is connected to the large end of the housing 7. During the processing, the housing 7 rotates to avoid rotating the sealing member and thus avoid wear of the second sealing ring 9.

[0054] In this embodiment, the liquid outlet structure is equipped with back pressure, that is, back pressure is applied to the main liquid outlet 4 so that the processing gap 18 can be completely filled with electrolyte, thereby further improving processing stability and processing accuracy.

[0055] It should be understood that the spindle connector 1, cathode 2, and positioning component are all made of stainless steel to meet rigidity requirements and also serve to transmit current. The enclosure 3, isolation component 5, and fixing component 10 are made of insulating material to interrupt current and reduce stray corrosion.

[0056] On the other hand, this embodiment also provides an electrolytic machining method, which uses the above-mentioned electrolytic machining apparatus, and the machining method includes:

[0057] S1. The connecting sleeve 12 is fitted onto the machine tool shaft and fixedly connected to the electrolytic machining equipment;

[0058] S2. The positioning plate 11 is connected to the machine tool spindle and aligned to ensure that the positioning plate 11 is concentric with the machine tool spindle;

[0059] Specifically, the positioning plate 11 is connected to the machine tool shaft by screws. The outer diameter of the positioning plate 11 is aligned by dial indicator, and then the screws are tightened to ensure the concentricity of the positioning plate 11 and the machine tool shaft.

[0060] S3. The enclosure 3 is connected to the connecting sleeve 12. The housing 7 is placed into the sealed cavity from the large end of the enclosure 3 and positioned on the positioning member. The fixing member 10 is fixedly connected to the positioning member to fix the housing 7 axially.

[0061] Specifically, the enclosure 3 and the connecting sleeve 12 are connected by screws. The housing 7 is inserted into the sealing ring from the large end of the enclosure 3. The inner ring surface of the small end of the housing 7 is installed on the stepped structure of the positioning member and is centered by cooperating with the outer ring surface of the stepped structure. The fixing member 10 and the positioning member are connected by screws so that the fixing member 10 presses and fixes the small end of the housing 7 on the positioning member.

[0062] S4. A second sealing ring 9 is provided between the isolation element 5 and the inner wall of the large end of the enclosure 3, and a first sealing ring 13 is embedded on the enclosure 3;

[0063] Specifically, a second sealing ring 9 is embedded in the outer ring groove of the isolation cover, and the isolation cover is connected to the fixing member 10 by fastening screws 6. A first sealing ring 13 is embedded in the groove of the sealing cover 3.

[0064] S5. The two ends of the spindle connector 1 are connected to the machine tool spindle and the cathode 2, respectively;

[0065] S6. The inlet 16 of the spindle connector 1 is connected to the inlet pipe, and the outlet structure of the sealed cover 3 is connected to the outlet pipe;

[0066] S7. The machine tool spindle feed causes the cathode 2 to extend into the machining cavity until the sealing structure presses the first sealing ring 13;

[0067] While the cathode 2 extends into the processing cavity and presses the first sealing ring 13 into the sealing structure, a processing gap 18 is formed between the cathode 2 and the housing 7.

[0068] S8. Electrolyte is introduced, and the electrolyte enters the processing gap 18 through the inlet 16, the first internal channel 15, and the second internal channel 14 in sequence, and flows out through the outlet structure; the processing power is turned on, the processing parameters are set, and electrolytic processing is performed.

[0069] This electrolytic machining method enables the machining of the casing 7 under closed flow field conditions. Compared with the previous open flow field, this machining method can ensure that the electrolyte in the machining gap 18 is more abundant, avoiding the phenomenon of insufficient electrolyte. This makes the flow field in the machining gap 18 more controllable and improves the machining stability. At the same time, the electrolyte flow direction in the gap is determined, the flow field parameters are more uniformly distributed, and the conductivity difference in various places is small, which is conducive to improving machining accuracy, improving wall thickness uniformity, and eliminating surface flow marks. In addition, it prevents electrolyte splashing, reduces corrosion of the machine tool inner wall, and improves equipment life.

[0070] On the other hand, this embodiment also provides an aero engine, including a casing, wherein the casing is processed using the above-mentioned electrolytic machining method.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electrolytic machining apparatus, used for electrolytic machining of an auxiliary casing (7) on an electrolytic machining equipment, the electrolytic machining equipment comprising a spindle connector (1), a cathode (2) and a machine tool spindle, wherein the spindle connector (1) is provided with a first internal channel (15) through which electrolyte passes, and the cathode (2) is provided with a second internal channel (14) through which electrolyte passes, characterized in that, The electrolytic processing apparatus includes: Positioning plate (11) is used to be installed on the machine tool spindle as a positioning reference and mounting base; The fastener (10) is used to press and fix the small end of the housing (7) onto the positioning plate (11) so that the housing (7) is axially and radially positioned on the machine tool spindle; A sealing assembly is used for installation on an electrolytic machining equipment. The sealing assembly has a sealing cavity for accommodating the machine tool spindle, the positioning plate (11), and the housing (7). The sealing cavity is spaced apart from the machine tool spindle, the positioning plate (11), and the housing (7). A machining cavity for the cathode (2) to pass through is opened on one side of the sealing assembly and communicates with the sealing cavity. The cathode (2) is provided with a sealing structure for sealing with the sealing assembly when the cathode (2) moves to a preset machining position and leaves a preset machining gap (18) between itself and the housing (7). The sealing assembly is also provided with a liquid outlet structure for leading out the electrolyte from the machining gap (18). The isolation element (5) is used to cover the large end of the casing (7) and to seal the inner wall of the large end of the sealing cavity.

2. An electrochemical machining apparatus according to claim 1, characterized by The positioning plate (11) has a stepped structure for engaging with the small end face of the casing (7). The stepped structure is annular, and the annular surface of the stepped structure matches the inner annular surface of the small end of the casing (7) to radially position the casing (7).

3. An electrochemical machining apparatus according to claim 1, wherein The liquid outlet structure includes a main liquid outlet (4) that is axially opened at one end of the sealing assembly near the large end of the casing and communicates with the processing cavity.

4. An electrochemical machining apparatus according to claim 1, wherein An auxiliary liquid outlet (8) is provided on the isolation component (5) to draw out the electrolyte from the inner wall of the casing (7).

5. An electrochemical machining apparatus according to claim 1, wherein The sealing structure includes a sealing protrusion formed at a predetermined position on the side wall of the cathode (2). The sealing assembly is fitted with a first sealing ring (13) on the side facing the machine tool spindle, so that when the machine tool spindle feeds and the cathode (2) extends into the machining cavity to a predetermined depth, the first sealing ring (13) abuts against the end face of the sealing protrusion.

6. The electrolytic processing apparatus according to claim 1, characterized in that, The sealing assembly has a second sealing ring (9) embedded in the inner wall of one end near the large end of the casing, which cooperates with the outer wall of the isolation member (5) to seal. Alternatively, the outer wall of the isolation member (5) has a second sealing ring (9) embedded in it, which cooperates with the inner wall of one end near the large end of the casing of the sealing assembly to seal.

7. An electrochemical machining apparatus according to claim 1, wherein The liquid outlet structure is equipped with back pressure.

8. An electrochemical machining apparatus according to any one of claims 1 to 7, wherein The sealing assembly includes a connecting sleeve (12) that is fixedly connected to the electrolytic machining equipment and sleeved outside the machine tool spindle, and a sealing cover (3) connected to the connecting sleeve (12). The height of the connecting sleeve (12) is less than the height of the machine tool spindle.

9. An electrochemical machining method, characterized by, The application includes the electrolytic machining apparatus as described in claim 8, wherein a first sealing ring (13) is embedded on the side of the sealing assembly facing the machine tool spindle, and a second sealing ring (9) is embedded on the inner wall of the end of the sealing assembly near the large end of the machine housing, which cooperates with the outer wall of the isolation member (5) for sealing; or, the outer wall of the isolation member (5) is embedded with a second sealing ring (9), which cooperates with the inner wall of the end of the sealing assembly near the large end of the machine housing for sealing; the machining method includes: S1. The connecting sleeve is fitted onto the machine tool spindle and fixedly connected to the electrolytic machining equipment; S2. The positioning plate is connected to the machine tool spindle and aligned to ensure that the positioning plate is concentric with the machine tool spindle; S3. The enclosure is connected to the connecting sleeve. The casing is placed into the sealed cavity from the large end of the enclosure and positioned on the positioning plate. The fixing part is fixedly connected to the positioning plate to fix the casing axially. S4. A second sealing ring is provided between the isolation component and the inner wall of the large end of the enclosure, and a first sealing ring is embedded on the enclosure. S5. The two ends of the spindle connector are respectively connected to the machine tool spindle and the cathode; S6. The inlet of the spindle connector is connected to the inlet pipe, and the outlet structure of the sealed cover is connected to the outlet pipe; S7. The machine tool spindle feed causes the cathode to extend into the machining cavity until the sealing structure presses against the first sealing ring; S8. Introduce electrolyte, which enters the processing gap sequentially through the inlet, the first internal channel, and the second internal channel, and flows out through the outlet structure; turn on the processing power supply, set the processing parameters, and perform electrolytic processing.

10. An aeroengine characterised in that, Includes a casing, wherein the casing is subjected to the electrolytic machining method as described in claim 9.

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